A lot of the old mods work just fine. Skip to leopard, skip travel, skip intro, My own sandman mod, Hyades Rim mod (much goodness there), Custom Salvage Flashpoint the Raid JK_Pilots and of Commander portait loader, mech resizer, Panic system.
The game is playable but you just don't get flash point missions, they're borked.
I haven't tried any of the mech engineer based mods such as 3062, etc. They're not really my thing. And they're seriously resource intensive..
Some of the mods older mods if they haven't been specifically updated for 1.8 will need a little TLC and massaging of the mod.json file to get em to work correctly in some cases.
If you try that make changes to one mod at a time. trust me.. that way you know whats to blame when it doesn't work. Or you just wait for the makers to update...